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    Re: Modern celestial navigation: when and why?
    From: Don Seltzer
    Date: 2015 Feb 12, 16:55 -0500

    On Thu, Feb 12, 2015 at 4:46 PM, David Pike  wrote:
    >...how William Bligh might have done a compass check...
    The pilots now their azimuth attend,
    On which all courses, duly form'd, depend :
    The compass placed to catch the rising ray,
    The quadrant's shadows studious they survey;
    Along the arch the gradual index slides,
    While Phoebus down the vertic-circle glides;
    Now seen on ocean's utmost verge to swim,
    He sweeps it vibrant with his nether limb.
    Thus height and polar distance are obtain'd,
    Then latitude, and declination, gain'd ;
    In chiliads next the analogy is sought,
    And on the sinical triangle wrought:
    By this magnetic variance is explored,
    Just angles known, and polar truth restored.
    - William Falconer, The Shipwreck
    Don Seltzer

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